1 files changed, 40 insertions, 0 deletions
diff --git a/lib/milestone_array.rb b/lib/milestone_array.rb
new file mode 100644
index 00000000000..4ed8485b36a
--- /dev/null
+++ b/lib/milestone_array.rb
@@ -0,0 +1,40 @@
+module MilestoneArray
+  class << self
+    def sort(array, sort_method)
+      case sort_method
+      when 'due_date_asc'
+        sort_asc_nulls_last(array, 'due_date')
+      when 'due_date_desc'
+        sort_desc_nulls_last(array, 'due_date')
+      when 'start_date_asc'
+        sort_asc_nulls_last(array, 'start_date')
+      when 'start_date_desc'
+        sort_desc_nulls_last(array, 'start_date')
+      when 'name_asc'
+        sort_asc(array, 'title')
+      when 'name_desc'
+        sort_asc(array, 'title').reverse
+      else
+        array
+      end
+    end
+
+    private
+
+    def sort_asc_nulls_last(array, attribute)
+      attribute = attribute.to_sym
+
+      array.select(&attribute).sort_by(&attribute) + array.reject(&attribute)
+    end
+
+    def sort_desc_nulls_last(array, attribute)
+      attribute = attribute.to_sym
+
+      array.select(&attribute).sort_by(&attribute).reverse + array.reject(&attribute)
+    end
+
+    def sort_asc(array, attribute)
+      array.sort_by(&attribute.to_sym)
+    end
+  end
+end